Heat exchange means



NOV. 17, 1936. 1 HAAG, JR 2,060,936

" HEAT EXCHANGE MEANS Filed Feb. 15, 1936 .Inge/1k Haag, Jl.' v Y ATTORNEY Patented Nov. 17, 1936 PATENT ori-ICE HEAT lEXCHAN GE MEANS Joseph Haag,

Jr., New York, N. Y.,

assignor to Todd Combustion Equipment, Inc., New York, N. Y., a corporation of New York Application February 15, 1936, Serial No. 63,990

8 Claims.

This invention relates to means of heat exchange whereby, for example, hot uid may be used to raise the temperature of liquid that is caused to pass in contact with a passageway for such hot uid, or vice versa.

In my improved device fuel oil intended for use in oil burning apparatus is passed spirally about an encased pipe that is traversed by steam, and it comprises a tubular jacket which may be slipped over the steam pipe, the said jacket having a 'spiral'I rib which extends outwardly into close proximity to the casing. A smaller rib or iin may be located between the turns of the first mentioned rib. The ribbed jacket may be either a single piece extending the full length of the interior of the casing or it may be made in sections properly fitted together so as to form a continuous spiral passage through the casing.

Other features and advantages of my invention will hereinafter appear.

In the drawingz- Figure 1 is a vertical sectional elevation of my improved heater, said View being further sectioned to show the keys between adjacent spiral sections.

Fig. 2 is a section Fig. 3 is a detail section or unit, and l Fig. 4 is a view, broken away, similar to Fig. 1, showing a modied form of spiral unit.

In Figs. 1 to 3 let I indicate a tubular heater on the line 2-2 of Fig. 1. elevation of a single spiral casing, whose lower end or base is inturned and apertured as at 2 toreceive a pipe 3 that is intended for the passage of a heating medium, such 5 as steam, the base portion surrounding said aperture forming a seat 4 for the support of a tubular device, composed of sections, whose lowermost section 5 rests upon said seat.

As has been stated, the tubular spiral device, though here shown as composed of sections, may instead consist of a single extended element.

The upper end of casing I is flanged, as at 6, and supports a flanged cap 'I which is secured thereto as by bolts 8.

Said cap 1 is apertured, as at 9, to receive the upper end of pipe 3, the cap portion surrounding said aperture forming a seat I to engage the uppermost section II of the tubular spiral device.

The assembly of the casing and its cap is of such nature that upon tightly bolting them together, with suitable packing I2 interposed between the casing and cap anges, the tubular spiral sections will be immovably bounditogether.

The tubular spiral sections, indicated at I3,

- ing,` the walls and surfaces which may consist of die castings, each have a hub portion I4 adapted to lit snugly over the pipe 3, and a spiral rib I that extends out radially to near the casing wall.

It is of course necessary that in assembling 5 the sections I3 on the pipe 3 they be so positioned one upon another to register their anges so that unitedly said sections will have a continuous spiral or screw which will enable a stream of oil to flow uninterruptedly through the casof the castings that form the spiral serving as convection heating surfaces, as well as directing the flow of the liquid.

A substantial increase in the heating surface is obtained by the incorporation of additional radiating fins, which may be relatively thin and of smaller radius, such iins being indicated at I6 and are shown as provided between the main spirals I5, spaced therefrom and running spirally and continuously therewith.

These additional radiating fins are equally applicable between the main spirals when the latter are formed upon the sections I3 ,or vapplied to an extended single unit.

As means for positioning the sections I3 in their relation of spiral registration they may be keyed together as by a pin I1 on each section which is entered within a hole I8 provided therefor in an adjacent section. All of the sections 3o or units forming the spiral are thus keyed together so that as assembled they form a continucus screw, and the keying is so arranged that the sections cannot be assembled and reassembled in any other than the correct manner.

Obviously, other suitable means may be employed for engaging the sections in registration.

This design lends itself to the economical construction of heaters having various lengths and diameters, covering a wide range of capacities.

Suitable stuffing boxes, indicated respectively at I9 and 20 are provided at the upper and lower ends of the casing.

An oil inlet, 2|, supplies oil to be heated at the lower end of the casing, for pressure flow upwardly about the spiral device, and for delivery through the outlet 22 which is located near the upper end of the casing.

The heating medium, which may be steam, `ils introduced into the pipe 3 at the upper end, and 50 passes to the condensate outlet-.located at the lower end of said pipe.

In the modified form of my invention illustrated in Fig. 4, the parts are identical with those of the preceding flgures, excepting only that travel through said casing, and spiral fins located intermediate the main spiral means to increase the radiating effect.

2. Heat exchange means comprising a tubular casing, means for passing liquid at a given temperature therethrough, a duct extended through said casing adapted for the passage of fluid at a diiierent temperature, a succession of spiral sectionssurrounding said duct to prolong the path of liquid travel through said casing, means of registration between said sections to constitute a continuous spiral, and means to bind said sections together and to said casing.

3. Heat exchange means comprising a tubular casing, means for passing liquid at a given temperature therethrough, a duct extended through said casing adapted for the passage oi fluid at a. different temperature, a succession of spiral sections surrounding said duct to prolong the path of liquid travel through said casing, said 'sec-' tions eachincluding a radial spiral rib and an adjacent spiral iin, and means oi registration'between said sections to spiral.

4. Heat exchange means comprising a tubular casing, means for passing liquid at a given temperature therethrough. a duct extended through constitute a continuous' 22,060,936.y the units I3 are devoid oi the fins I6 intermesaid casing adapted for the passage of iiuid at a different temperature, a succession of spiral sections surrounding said duct to prolong the path of liquid travel through said casing, said sections each including a radial spiral rib and an adjacent spiral iin, means of registration between said sections to constitute a 'continuous spiral, and means to bind said sections together and to said casing.

5. A liquid heater comprising a tubular casing having inlet and outlet means respectively near opposite ends thereof, 'a steam conveying pipe extended through said casing, a succession of removable spiral sections surrounding said pipe, means for keying said sections together to form a continuous spiral, and means within said casing for bindingy said sections together and to said casing.

6. A succession of spiral sections comprising each a hub and a radial spiral rib, together with means for relatively positioning said sections to form a continuous spiral.

7. A succession of spiral sections comprising each a hub, ,a radial spiral rib and a spiral fin spaced therefrom, together with means for relatively positioning said sections to form a continuo us spiral. f 8. A liquid heater comprising a tubular casing having inlet and outletv means respectively near opposite ends thereof, a removable cap at the upper end of said casing, a steam conveying pipe extended through said casing and cap, said casing at its lowerend and in its cap respectively provided with seating means, a succession of removable spiral sections surrounding 'said pipe, and means -gfor keying said sections together to form a continuous spiral, said seating means engaging the lowermost and uppermost sections to bind all the sections together landto the casing.

JOSEPH HAAG, JR. 

